<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>点击下载</title>
</head>
<body>

  <div>
    这是下载页面

    <a href="/pdf" download="xxxxx">
      <button style="width: 100px;height: 100px;">点击下载</button>
    </a>
  </div>

</body>
</html>